Arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and design method

An ultra-high-performance, tunnel segment technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of stress relaxation bolt joints between ring joints, poor crack resistance, water leakage, concrete damage, etc., to achieve The effect of reducing the amount of concrete used, alleviating serious water leakage, and improving bearing capacity

Active Publication Date: 2021-04-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a soffit type ultra-high performance concrete prefabricated shield tunnel segment structure to solve the problems of poor crack resistance, serious water leakage, stress relaxation between annular joints and local concrete failure at bolt joints during the operation of the segment structure. Three major technical issues

Method used

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  • Arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and design method
  • Arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and design method
  • Arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and design method

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Experimental program
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Effect test

Embodiment 1

[0155] Such as Figure 1-11 As shown, a soffit type ultra-high performance concrete prefabricated shield tunnel segment, including:

[0156] Soffit 1, located in the soffit area of ​​the main body of the ultra-high performance concrete segment;

[0157] Segment seam groove 2;

[0158] Straight bolt reserved hole 4;

[0159] The first reinforcing rib 3 is located at the reserved hole 4 for straight bolts;

[0160] The local reinforcement band 5 is located at the edge of the main body of the segment;

[0161] Segment grouting hole 6;

[0162] The second reinforcing rib 7 is located at the grouting hole 6 of the segment;

[0163] Hand hole 8, near the hand hole 8 is the concrete reinforcement area;

[0164] Local reinforcement with steel bars 9;

[0165] The soffit steel bar 10 is located in the soffit area of ​​the main body of the segment;

[0166] The spiral steel bar 11 is located at the grouting hole 6 of the segment.

[0167] 1) The soffit area of ​​the main body o...

Embodiment 2

[0180] A shield tunnel segment has an outer diameter of 6000mm and a ring width of 1500mm. The overall tunnel segment is made of ultra-high performance concrete material, the concrete grade is UC120, the steel bar type is HRB400, the thickness of the concrete cover layer is 20mm, the design load of the minimum reinforcement ratio is the maximum positive bending moment design value of 277.0kN·m, and the corresponding axial force design Value - 1867.5kN.

[0181] The design method of the main soffit area of ​​the soffit ultra-high performance concrete shield tunnel segment is as follows:

[0182] 1. According to the strength of the ultra-high performance concrete material used, the type of steel bar and the internal force generated by the external load calculated according to the code, the longitudinal normal section size of the segment is determined, and the thickness h of the vault is determined 1 and arch foot thickness h 2 .

[0183] Preliminary drafting of vault thicknes...

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Abstract

The invention relates to an arch web type ultra-high performance concrete prefabricated shield tunnel segment structure and a design method. The segment structure comprises a segment main body, wherein the segment main body comprises an arch crown, an arch web, an arch foot, a reinforcing mesh in concrete, a segment grouting hole and a segment joint groove, wherein the cross section of the arch web is of a cambered surface sheet-shaped structure, and the arch web has an arched longitudinal section. The method specifically comprises the following steps of 1), determining the thickness h1 of the arch crown and the thickness h2 of the arch foot; 2), calculating the bearing capacity of the normal section of the arch web area of the ultra-high performance concrete segment main body, and enabling the normal section of the arch web area to be equivalent to a rectangular section for reinforcement calculation; 3), rechecking of internal force of segment main body arch web area; and 4), comparing reinforcement results calculated according to the bearing capacity of the normal section of the flexural member with reinforcement results calculated according to the bearing capacity of the normal section of the large eccentric compression member, and selecting a scheme with a large reinforcement area for reinforcement. The method can solve the problem of poor crack resistance of the segment structure.

Description

technical field [0001] The invention relates to the technical field of subway shield tunnel segment structures, in particular to a soffit type ultra-high performance concrete prefabricated shield tunnel segment structure; [0002] The present invention also relates to a design method for the above-mentioned segment structure. Background technique [0003] With the advancement of urbanization, the construction of urban rail transit tunnels in my country is advancing rapidly. As the main construction form of urban underground tunnel construction, shield tunneling method is widely used in the construction of urban underground space projects such as subways, underground pipe galleries and underground drainage channels. However, during the operation stage of the shield tunnel, the shield tunnel segments inevitably have different degrees of damage cracks, stress relaxation, and local damage to the joints, which eventually lead to engineering problems such as excessive deformation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08E21D11/10G06F30/13G06F30/17
CPCE21D11/08E21D11/105G06F30/13G06F30/17
Inventor 陈仁朋吴怀娜冯东林刘源张阳孟凡衍程红战阮世强
Owner HUNAN UNIV
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